<template>
  <div class="search-container">
    <!-- 搜索页面头部 -->
    <div class="search-header">
      <!-- 后退按钮 -->
      <van-icon name="arrow-left" color="white" size="0.48rem" class="goback"
        @click="$router.back()" />
      <!-- 搜索组件 -->
      <van-search v-model="keyword" placeholder="请输入搜索关键词" background="#007BFF" shape="round"
        v-myfocus @input="getSuggListFn" @search="goto(keyword)" />
    </div>
    <!-- 搜索建议列表 -->
    <ul class="sugg-list" v-if="keyword">
      <li class="sugg-item" v-for="(str, index) in suggList" :key="index" v-html="highlightFn(str)"
        @click="goto(str)">
      </li>
    </ul>
    <!-- 搜索历史 -->
    <div class="search-history" v-else>
      <!-- 标题 -->
      <van-cell title="搜索历史">
        <!-- 使用 right-icon 插槽来自定义右侧图标 -->
        <template #right-icon>
          <van-icon name="delete" class="search-icon" @click="clearHistory" />
        </template>
      </van-cell>

      <!-- 历史列表 -->
      <div class="history-list">
        <span class="history-item" v-for="(str, index) in history" :key="index"
          @click="goto(str)">{{ str }}</span>
      </div>
    </div>
  </div>
</template>

<script>
import { getSuggListAPI } from '@/api/search'
export default {
  data () {
    return {
      keyword: '', // 搜索关键字
      suggList: [], // 搜索建议列表
      history: JSON.parse(localStorage.getItem('history')) || ['API', 'java', 'css', '前端', '后台接口', 'python'] // 搜索历史
    }
  },
  methods: {
    // 获取联想列表
    getSuggListFn () {
      this.timer && clearTimeout(this.timer)
      this.timer = setTimeout(async () => {
        if (!this.keyword) {
          this.suggList = []
          return
        }
        const res = await getSuggListAPI({ q: this.keyword })
        this.suggList = res.data.data.options
      }, 500)
    },
    // 关键字高亮的函数
    highlightFn (str) {
      const reg = new RegExp(this.keyword, 'ig')
      return str && str.replace(reg, match => `<span style="color: #f00;">${match}</span>`)
    },
    // 跳转到搜索结果页
    goto (keyword) {
      // 把记录存储到本地
      if (!this.history.includes(keyword)) {
        this.history.unshift(keyword)
      }
      localStorage.setItem('history', JSON.stringify(this.history))
      this.$router.push(`/search/${keyword}`)
    },
    // 清空历史记录
    async clearHistory () {
      try {
        await this.$dialog.confirm({
          message: '确定清空所有历史记录吗?'
        })
        localStorage.removeItem('history')
        this.history = []
      } catch (e) {

      }
    }
  }
}
</script>

<style scoped lang="less">
.search-header {
  display: flex;
  align-items: center;
  height: 46px;
  background-color: #007bff;
  overflow: hidden;
  /*后退按钮*/
  .goback {
    padding-left: 14px;
  }
  /*搜索组件*/
  .van-search {
    flex: 1;
  }
}
/*搜索建议列表样式 */
.sugg-list {
  .sugg-item {
    padding: 0 15px;
    border-bottom: 1px solid #f8f8f8;
    font-size: 14px;
    line-height: 50px;
    // 实现省略号的三行代码
    white-space: nowrap;
    overflow: hidden;
    text-overflow: ellipsis;
  }
}
/**搜索历史 */
.search-icon {
  font-size: 16px;
  line-height: inherit;
}

.history-list {
  padding: 0 10px;
  .history-item {
    display: inline-block;
    font-size: 12px;
    padding: 8px 14px;
    background-color: #efefef;
    margin: 10px 8px 0px 8px;
    border-radius: 10px;
  }
}
</style>
